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04c17aa8 TM |
1 | /* |
2 | * Copyright (C) 2010 OKI SEMICONDUCTOR Co., LTD. | |
3 | * | |
4 | * This program is free software; you can redistribute it and/or modify | |
5 | * it under the terms of the GNU General Public License as published by | |
6 | * the Free Software Foundation; version 2 of the License. | |
7 | * | |
8 | * This program is distributed in the hope that it will be useful, | |
9 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
10 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
11 | * GNU General Public License for more details. | |
12 | * | |
13 | * You should have received a copy of the GNU General Public License | |
14 | * along with this program; if not, write to the Free Software | |
15 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307, USA. | |
16 | */ | |
17 | #include <linux/kernel.h> | |
18 | #include <linux/pci.h> | |
19 | #include <linux/gpio.h> | |
20 | ||
21 | #define PCH_GPIO_ALL_PINS 0xfff /* Mask for GPIO pins 0 to 11 */ | |
22 | #define GPIO_NUM_PINS 12 /* Specifies number of GPIO PINS GPIO0-GPIO11 */ | |
23 | ||
24 | struct pch_regs { | |
25 | u32 ien; | |
26 | u32 istatus; | |
27 | u32 idisp; | |
28 | u32 iclr; | |
29 | u32 imask; | |
30 | u32 imaskclr; | |
31 | u32 po; | |
32 | u32 pi; | |
33 | u32 pm; | |
34 | u32 im0; | |
35 | u32 im1; | |
36 | u32 reserved[4]; | |
37 | u32 reset; | |
38 | }; | |
39 | ||
40 | /** | |
41 | * struct pch_gpio_reg_data - The register store data. | |
42 | * @po_reg: To store contents of PO register. | |
43 | * @pm_reg: To store contents of PM register. | |
44 | */ | |
45 | struct pch_gpio_reg_data { | |
46 | u32 po_reg; | |
47 | u32 pm_reg; | |
48 | }; | |
49 | ||
50 | /** | |
51 | * struct pch_gpio - GPIO private data structure. | |
52 | * @base: PCI base address of Memory mapped I/O register. | |
53 | * @reg: Memory mapped PCH GPIO register list. | |
54 | * @dev: Pointer to device structure. | |
55 | * @gpio: Data for GPIO infrastructure. | |
56 | * @pch_gpio_reg: Memory mapped Register data is saved here | |
57 | * when suspend. | |
58 | */ | |
59 | struct pch_gpio { | |
60 | void __iomem *base; | |
61 | struct pch_regs __iomem *reg; | |
62 | struct device *dev; | |
63 | struct gpio_chip gpio; | |
64 | struct pch_gpio_reg_data pch_gpio_reg; | |
65 | struct mutex lock; | |
66 | }; | |
67 | ||
68 | static void pch_gpio_set(struct gpio_chip *gpio, unsigned nr, int val) | |
69 | { | |
70 | u32 reg_val; | |
71 | struct pch_gpio *chip = container_of(gpio, struct pch_gpio, gpio); | |
72 | ||
73 | mutex_lock(&chip->lock); | |
74 | reg_val = ioread32(&chip->reg->po); | |
75 | if (val) | |
76 | reg_val |= (1 << nr); | |
77 | else | |
78 | reg_val &= ~(1 << nr); | |
79 | ||
80 | iowrite32(reg_val, &chip->reg->po); | |
81 | mutex_unlock(&chip->lock); | |
82 | } | |
83 | ||
84 | static int pch_gpio_get(struct gpio_chip *gpio, unsigned nr) | |
85 | { | |
86 | struct pch_gpio *chip = container_of(gpio, struct pch_gpio, gpio); | |
87 | ||
88 | return ioread32(&chip->reg->pi) & (1 << nr); | |
89 | } | |
90 | ||
91 | static int pch_gpio_direction_output(struct gpio_chip *gpio, unsigned nr, | |
92 | int val) | |
93 | { | |
94 | struct pch_gpio *chip = container_of(gpio, struct pch_gpio, gpio); | |
95 | u32 pm; | |
96 | u32 reg_val; | |
97 | ||
98 | mutex_lock(&chip->lock); | |
99 | pm = ioread32(&chip->reg->pm) & PCH_GPIO_ALL_PINS; | |
100 | pm |= (1 << nr); | |
101 | iowrite32(pm, &chip->reg->pm); | |
102 | ||
103 | reg_val = ioread32(&chip->reg->po); | |
104 | if (val) | |
105 | reg_val |= (1 << nr); | |
106 | else | |
107 | reg_val &= ~(1 << nr); | |
108 | ||
109 | mutex_unlock(&chip->lock); | |
110 | ||
111 | return 0; | |
112 | } | |
113 | ||
114 | static int pch_gpio_direction_input(struct gpio_chip *gpio, unsigned nr) | |
115 | { | |
116 | struct pch_gpio *chip = container_of(gpio, struct pch_gpio, gpio); | |
117 | u32 pm; | |
118 | ||
119 | mutex_lock(&chip->lock); | |
120 | pm = ioread32(&chip->reg->pm) & PCH_GPIO_ALL_PINS; /*bits 0-11*/ | |
121 | pm &= ~(1 << nr); | |
122 | iowrite32(pm, &chip->reg->pm); | |
123 | mutex_unlock(&chip->lock); | |
124 | ||
125 | return 0; | |
126 | } | |
127 | ||
128 | /* | |
129 | * Save register configuration and disable interrupts. | |
130 | */ | |
131 | static void pch_gpio_save_reg_conf(struct pch_gpio *chip) | |
132 | { | |
133 | chip->pch_gpio_reg.po_reg = ioread32(&chip->reg->po); | |
134 | chip->pch_gpio_reg.pm_reg = ioread32(&chip->reg->pm); | |
135 | } | |
136 | ||
137 | /* | |
138 | * This function restores the register configuration of the GPIO device. | |
139 | */ | |
140 | static void pch_gpio_restore_reg_conf(struct pch_gpio *chip) | |
141 | { | |
142 | /* to store contents of PO register */ | |
143 | iowrite32(chip->pch_gpio_reg.po_reg, &chip->reg->po); | |
144 | /* to store contents of PM register */ | |
145 | iowrite32(chip->pch_gpio_reg.pm_reg, &chip->reg->pm); | |
146 | } | |
147 | ||
148 | static void pch_gpio_setup(struct pch_gpio *chip) | |
149 | { | |
150 | struct gpio_chip *gpio = &chip->gpio; | |
151 | ||
152 | gpio->label = dev_name(chip->dev); | |
153 | gpio->owner = THIS_MODULE; | |
154 | gpio->direction_input = pch_gpio_direction_input; | |
155 | gpio->get = pch_gpio_get; | |
156 | gpio->direction_output = pch_gpio_direction_output; | |
157 | gpio->set = pch_gpio_set; | |
158 | gpio->dbg_show = NULL; | |
159 | gpio->base = -1; | |
160 | gpio->ngpio = GPIO_NUM_PINS; | |
161 | gpio->can_sleep = 0; | |
162 | } | |
163 | ||
164 | static int __devinit pch_gpio_probe(struct pci_dev *pdev, | |
165 | const struct pci_device_id *id) | |
166 | { | |
167 | s32 ret; | |
168 | struct pch_gpio *chip; | |
169 | ||
170 | chip = kzalloc(sizeof(*chip), GFP_KERNEL); | |
171 | if (chip == NULL) | |
172 | return -ENOMEM; | |
173 | ||
174 | chip->dev = &pdev->dev; | |
175 | ret = pci_enable_device(pdev); | |
176 | if (ret) { | |
177 | dev_err(&pdev->dev, "%s : pci_enable_device FAILED", __func__); | |
178 | goto err_pci_enable; | |
179 | } | |
180 | ||
181 | ret = pci_request_regions(pdev, KBUILD_MODNAME); | |
182 | if (ret) { | |
183 | dev_err(&pdev->dev, "pci_request_regions FAILED-%d", ret); | |
184 | goto err_request_regions; | |
185 | } | |
186 | ||
187 | chip->base = pci_iomap(pdev, 1, 0); | |
188 | if (chip->base == 0) { | |
189 | dev_err(&pdev->dev, "%s : pci_iomap FAILED", __func__); | |
190 | ret = -ENOMEM; | |
191 | goto err_iomap; | |
192 | } | |
193 | ||
194 | chip->reg = chip->base; | |
195 | pci_set_drvdata(pdev, chip); | |
196 | mutex_init(&chip->lock); | |
197 | pch_gpio_setup(chip); | |
198 | ret = gpiochip_add(&chip->gpio); | |
199 | if (ret) { | |
200 | dev_err(&pdev->dev, "PCH gpio: Failed to register GPIO\n"); | |
201 | goto err_gpiochip_add; | |
202 | } | |
203 | ||
204 | return 0; | |
205 | ||
206 | err_gpiochip_add: | |
207 | pci_iounmap(pdev, chip->base); | |
208 | ||
209 | err_iomap: | |
210 | pci_release_regions(pdev); | |
211 | ||
212 | err_request_regions: | |
213 | pci_disable_device(pdev); | |
214 | ||
215 | err_pci_enable: | |
216 | kfree(chip); | |
217 | dev_err(&pdev->dev, "%s Failed returns %d\n", __func__, ret); | |
218 | return ret; | |
219 | } | |
220 | ||
221 | static void __devexit pch_gpio_remove(struct pci_dev *pdev) | |
222 | { | |
223 | int err; | |
224 | struct pch_gpio *chip = pci_get_drvdata(pdev); | |
225 | ||
226 | err = gpiochip_remove(&chip->gpio); | |
227 | if (err) | |
228 | dev_err(&pdev->dev, "Failed gpiochip_remove\n"); | |
229 | ||
230 | pci_iounmap(pdev, chip->base); | |
231 | pci_release_regions(pdev); | |
232 | pci_disable_device(pdev); | |
233 | kfree(chip); | |
234 | } | |
235 | ||
236 | #ifdef CONFIG_PM | |
237 | static int pch_gpio_suspend(struct pci_dev *pdev, pm_message_t state) | |
238 | { | |
239 | s32 ret; | |
240 | struct pch_gpio *chip = pci_get_drvdata(pdev); | |
241 | ||
242 | pch_gpio_save_reg_conf(chip); | |
243 | pch_gpio_restore_reg_conf(chip); | |
244 | ||
245 | ret = pci_save_state(pdev); | |
246 | if (ret) { | |
247 | dev_err(&pdev->dev, "pci_save_state Failed-%d\n", ret); | |
248 | return ret; | |
249 | } | |
250 | pci_disable_device(pdev); | |
251 | pci_set_power_state(pdev, PCI_D0); | |
252 | ret = pci_enable_wake(pdev, PCI_D0, 1); | |
253 | if (ret) | |
254 | dev_err(&pdev->dev, "pci_enable_wake Failed -%d\n", ret); | |
255 | ||
256 | return 0; | |
257 | } | |
258 | ||
259 | static int pch_gpio_resume(struct pci_dev *pdev) | |
260 | { | |
261 | s32 ret; | |
262 | struct pch_gpio *chip = pci_get_drvdata(pdev); | |
263 | ||
264 | ret = pci_enable_wake(pdev, PCI_D0, 0); | |
265 | ||
266 | pci_set_power_state(pdev, PCI_D0); | |
267 | ret = pci_enable_device(pdev); | |
268 | if (ret) { | |
269 | dev_err(&pdev->dev, "pci_enable_device Failed-%d ", ret); | |
270 | return ret; | |
271 | } | |
272 | pci_restore_state(pdev); | |
273 | ||
274 | iowrite32(0x01, &chip->reg->reset); | |
275 | iowrite32(0x00, &chip->reg->reset); | |
276 | pch_gpio_restore_reg_conf(chip); | |
277 | ||
278 | return 0; | |
279 | } | |
280 | #else | |
281 | #define pch_gpio_suspend NULL | |
282 | #define pch_gpio_resume NULL | |
283 | #endif | |
284 | ||
285 | static DEFINE_PCI_DEVICE_TABLE(pch_gpio_pcidev_id) = { | |
286 | { PCI_DEVICE(PCI_VENDOR_ID_INTEL, 0x8803) }, | |
287 | { 0, } | |
288 | }; | |
289 | ||
290 | static struct pci_driver pch_gpio_driver = { | |
291 | .name = "pch_gpio", | |
292 | .id_table = pch_gpio_pcidev_id, | |
293 | .probe = pch_gpio_probe, | |
294 | .remove = __devexit_p(pch_gpio_remove), | |
295 | .suspend = pch_gpio_suspend, | |
296 | .resume = pch_gpio_resume | |
297 | }; | |
298 | ||
299 | static int __init pch_gpio_pci_init(void) | |
300 | { | |
301 | return pci_register_driver(&pch_gpio_driver); | |
302 | } | |
303 | module_init(pch_gpio_pci_init); | |
304 | ||
305 | static void __exit pch_gpio_pci_exit(void) | |
306 | { | |
307 | pci_unregister_driver(&pch_gpio_driver); | |
308 | } | |
309 | module_exit(pch_gpio_pci_exit); | |
310 | ||
311 | MODULE_DESCRIPTION("PCH GPIO PCI Driver"); | |
312 | MODULE_LICENSE("GPL"); |